0xb44ada17 in __libc_res_nquery () from /lib/libresolv.so.2

(gdb) bt full
#0  0xb44ada17 in __libc_res_nquery () from /lib/libresolv.so.2
No symbol table info available.
#1  0xb44adf8b in __libc_res_nquerydomain () from /lib/libresolv.so.2
No symbol table info available.
#2  0xb44ae3c5 in __libc_res_nsearch () from /lib/libresolv.so.2
No symbol table info available.
#3  0xae34e8e0 in _nss_dns_gethostbyname4_r () from /lib/libnss_dns.so.2
No symbol table info available.
#4  0xb7dff1a3 in gaih_inet () from /lib/libc.so.6
No symbol table info available.
#5  0xb7e020d5 in getaddrinfo () from /lib/libc.so.6
No symbol table info available.
#6  0xb78ce187 in PR_GetAddrInfoByName () from /usr/lib/libnspr4.so
No symbol table info available.
#7  0xb57fac49 in nsHostResolver::ThreadFunc (arg=0x81689f8) at nsHostResolver.cpp:888
        flags = -1590759015
        status = <value optimized out>
        rec = 0xa12ef158
        ai = 0xb78e1c26
#8  0xb78db711 in ?? () from /usr/lib/libnspr4.so
No symbol table info available.
#9  0xb7fa5cf2 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#10 0xb7e1a0ae in clone () from /lib/libc.so.6
No symbol table info available.